#!/usr/bin/env bun
// Builds the npm package's CLI: one Node ESM bundle, dist/storebound.mjs (package.json "bin"), so `npx storebound`
// runs on Node 20+ and `bunx storebound` keeps working. Zero runtime dependencies: playwright stays an optional peer
// resolved from the project at run time (playwright-core only in the compiled sidecar), so it is left out.
//   bun tools/build-node.ts            write dist/storebound.mjs (npm pack / publish run it: prepack)
//   bun tools/build-node.ts --out <f>  write elsewhere (tests)
// The bundle is checked for this machine's home and checkout paths (like the sidecar): nothing private may ship.
import { chmodSync, mkdirSync, mkdtempSync, readdirSync, readFileSync, rmSync, statSync, writeFileSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { dirname, join, relative, resolve } from 'node:path';
import { privateStrings, ROOT } from './build-sidecars';

/** Packages the CLI only imports at run time from the project (or never under Node). */
export const NODE_EXTERNALS = ['playwright', 'playwright-core', 'electron', 'chromium-bidi'];
export const NODE_BUNDLE = join(ROOT, 'dist', 'storebound.mjs');

export function buildNode(out = NODE_BUNDLE): { path: string; bytes: number } {
  const dir = mkdtempSync(join(tmpdir(), 'sb-node-'));
  try {
    const tmp = join(dir, 'storebound.mjs');
    const p = Bun.spawnSync(['bun', 'build', 'cli/index.ts', '--target=node', '--format=esm', ...NODE_EXTERNALS.flatMap(e => ['--external', e]), '--outfile', tmp],
      { cwd: ROOT, stdout: 'pipe', stderr: 'pipe' });
    if (p.exitCode !== 0) throw new Error(`bun build failed\n${p.stderr.toString()}${p.stdout.toString()}`);
    // the entry's own `#!/usr/bin/env bun` and Bun's `// @bun` marker go; node runs this file
    const body = readFileSync(tmp, 'utf8').replace(/^#!.*\n/, '').replace(/^\/\/ @bun[^\n]*\n/, '');
    const js = `#!/usr/bin/env node\n${body}`;
    const bunGlobal = /\bBun\.[a-zA-Z]/.exec(js);
    if (bunGlobal) throw new Error(`the Node bundle uses the Bun global (${bunGlobal[0]}...): go through cli/lib/rt.ts`);
    const leaked = privateStrings().filter(s => js.includes(s));
    if (leaked.length) throw new Error(`the Node bundle contains private paths (${leaked.length}); refusing to write it`);
    mkdirSync(dirname(out), { recursive: true });
    writeFileSync(out, js);
    chmodSync(out, 0o755);
    return { path: out, bytes: statSync(out).size };
  } finally { rmSync(dir, { recursive: true, force: true }); }
}

/** The package's import entry ('storebound', the ShipConfig types of storebound.config.ts): declarations in
 *  dist/types for tsc (next build, vue-tsc, ts-loader: TypeScript never takes a package's .ts source as its types) and
 *  dist/config.js for runtimes other than Bun (Bun keeps importing cli/lib/config.ts). */
export function buildEntry(dir = join(ROOT, 'dist')): void {
  const types = join(dir, 'types');
  rmSync(types, { recursive: true, force: true });
  const tsc = Bun.spawnSync([join(ROOT, 'node_modules', '.bin', 'tsc'), '-p', 'tsconfig.types.json', '--outDir', types], { cwd: ROOT, stdout: 'pipe', stderr: 'pipe' });
  if (tsc.exitCode !== 0) throw new Error(`tsc (declarations) failed\n${tsc.stdout.toString()}${tsc.stderr.toString()}`);
  if (!statSync(join(types, 'lib', 'config.d.ts'), { throwIfNoEntry: false })) throw new Error('no dist/types/lib/config.d.ts');
  pruneDeclarations(types, 'lib/config.d.ts');
  const js = Bun.spawnSync(['bun', 'build', 'cli/lib/config.ts', '--target=node', '--format=esm', ...NODE_EXTERNALS.flatMap(e => ['--external', e]), '--outfile', join(dir, 'config.js')], { cwd: ROOT, stdout: 'pipe', stderr: 'pipe' });
  if (js.exitCode !== 0) throw new Error(`bun build (config entry) failed\n${js.stderr.toString()}`);
  const leaked = privateStrings().filter(s => readFileSync(join(dir, 'config.js'), 'utf8').includes(s));
  if (leaked.length) throw new Error(`dist/config.js contains private paths (${leaked.length})`);
}

/** Keeps the declarations reachable from `entry` (tsc emits one per file of the program) and makes them stand alone
 *  in any project: relative imports get `.js` (node16 / nodenext need it), and `Buffer` becomes a local alias of
 *  Uint8Array where the project may not have @types/node. Pure on the folder; returns the files kept. */
export function pruneDeclarations(dir: string, entry: string): string[] {
  const keep = new Set<string>();
  const todo = [entry];
  const spec = /(from\s+|import\()(['"])(\.{1,2}\/[^'"]+?)(?:\.js)?\2/g;
  while (todo.length) {
    const f = todo.pop()!;
    if (keep.has(f)) continue;
    keep.add(f);
    for (const m of readFileSync(join(dir, f), 'utf8').matchAll(spec)) todo.push(join(dirname(f), `${m[3]}.d.ts`));
  }
  const walk = (d: string): string[] => readdirSync(join(dir, d), { withFileTypes: true }).flatMap(e => e.isDirectory() ? walk(join(d, e.name)) : [join(d, e.name)]);
  for (const f of walk('.')) {
    if (!keep.has(f)) { rmSync(join(dir, f)); continue; }
    let t = readFileSync(join(dir, f), 'utf8').replace(spec, (_m, kw: string, q: string, p: string) => `${kw}${q}${p}.js${q}`);
    if (/\bBuffer\b/.test(t)) t = `type Buffer = Uint8Array;\n${t}`;
    if (/['"]node:|\bBun\./.test(t.replace(/\/\*[\s\S]*?\*\/|\/\/.*$/gm, ''))) throw new Error(`${f}: the package's declarations need Node or Bun types`);
    writeFileSync(join(dir, f), t);
  }
  for (const d of walk('.').map(f => dirname(f))) if (!readdirSync(join(dir, d)).length) rmSync(join(dir, d), { recursive: true });
  return [...keep].sort();
}

if (import.meta.main) {
  const i = process.argv.indexOf('--out');
  const t = Date.now();
  const r = buildNode(i >= 0 ? resolve(process.argv[i + 1]!) : NODE_BUNDLE);
  console.log(`node bundle -> ${relative(process.cwd(), r.path) || r.path} (${(r.bytes / 1e6).toFixed(2)} MB, ${((Date.now() - t) / 1000).toFixed(1)}s)`);
  if (i < 0) { buildEntry(); console.log('package entry -> dist/types (declarations), dist/config.js'); }
}